<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/datepick.css">
    <style>
        input {
            margin-left: 50px;
            width: 270px;
            height: 40px;
            border: 1px solid #c9c9c9;
            -webkit-border-radius:2px;
            -moz-border-radius:2px;
            border-radius:2px;
        }
        input:focus {
            border-color: aqua;
        }

    </style>
</head>
<body>
    <input type="text" id="dateInput">
    <script src="js/datepick.js"></script>
    <script>
        new datePick("#dateInput");
    </script>
</body>
</html>